Instructors may assign a portion of the Review Sheet questions using Mastering A

Question

Instructors may assign a portion of the Review Sheet questions using Mastering A&p 32: REVIEW SHEET Anatomy of Blood Vessels Name Lab Time/Date Microscopic Structure of the Blood Vessels 1. Cross-sectional views of an artery and of a vein are shown here. Identify each; on the Ines to the sides, note the structural details that enabled you to make these identifications (vessel type) (vessel type Now describe each the answer lines tunic more fully by selecting its characteristics from the key below and placing the appropriate key letters on Tunica intima Tunica media Tunica externa Key a. innermost tunic b. most superficial tunic C. thin tunic of capillaries d. regulates blood vessel diameter e contains smooth muscle and elastin f. has a smooth surface to decrease resistance to blood flow 2. Describe the role that valves play in returning blood to the heart 3. Name two events occurring within the body that aid in venous return. and 4. Considering their functional differences, why do you think the walls of arteries are proportionately thicker than those of the corresponding veins? 479

Explanation / Answer

Number 1

Vessel rype: artery

A) open, circular lumen

B) thick media

Vessel type: vein

A) somewhat collapsed lumen

B) thinner media

Innermost tunic

Has smooth surface to decrease

Resistance to blood flow

Thin tunic of capillaries

Contains smooth surface and elastin

Tunica externa - most superficial tunic

2 veins carry blood back to the heart aortic valve

3 1. Skeletal muscle milking action

2 changes in thoracic cavity pressure

4 arteries must withstand high pressure and pressure fluctuations

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